Incandescent lamp.



F. M. BENNETT,

' INGANDESCENT LAMP.

APPLICATION FILED MAR.6.1908.

Patented Sept. 15, 1908.

5 m undo:

wit" zoom FREDERICK M. BENNETT, OF NEW YORK, N. Y.

ENQANDESCENT LAMP.

No. seems.

State of New York, have invented a certain new and useful Incandescent Lamp, of which the following is a specification, the same be' ing a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to the construction of an electrical glow-lamp, and in particular to a novel forming or looping oi' the filament of the lamp for the purpose oi securing a more advantageous distribution of the light, as will behereinaftcr more fully described, reference being had to the accompanying drawings in which Figures 1 and 2 are sidcelevatious ofa lamp constructed according'to my invention, and Fig. 3 is a plan view of the same.

The bulb A of the lamp may be of any ordinary or suitable construction and has a mount a through which the leads a are passed.

The filament B consists of a plurality of loo s located relatively approximately at rig it angles to each other, and, as ordinarily constructed, it comprises one or more practically vertical central convolutions b, and a )lurality of approximately horizontal loops l, the number of the couvolutions being varied according to the voltage at which the lamp is. to he run, and also according to the amount of luminous surface desired to be presented when viewed from the lower or tip end of the lamp.

in the embodiment shown in the drawings, l employ two approximately horizontal loops on each side ol the longitudinal axis of the lamp, but, obviously, one of the convolutions on each sidc of the vertical loop may be dis icnsed with, if preferred.

5y employing the above described couvolutions, the light is manifestly thrown not only sidewisc from the lamp, but an increased light downward is also obtained.

One or more anchors a may be used, which are ordinarily secured to the mount a, and

attached to the filament intermediate of the ends thereof, whereby the filament is uractically rigidly held in position, and is t rereforo not liable to become broken by reason of jars or shocks.

Specification of Letters Patent.

Patented Sept. 1:, recs.

Application filed lilarch fi, 138.8. Serial No. 419,536.

In the operation of assembling the parts of the lamp, the filament, after it has been formed and carbonized, has to be attached to the leads and also to the anchors. ln doing this it is not practicable to resent filaments in the various completed amps, made according to this invention, of the same identical shape in every particular, inasmuch as drawing the same down for attachment to the leads and anchors will necessarily throw the loops in somewhat different shapes in ditierent lamps, but in all such cases, the main characteristics and mproximate relative position of the loops will be maintained. It is therefore manifest that the size, number, contour or shape, and relative position of the loops of the filament may be varied, so long as the essential feature of the lamp is pro served, namely, the use of. a substantially vertical loop to, throw the light sidewise, in conjunction with another an ularly disposed filament loop to throw the light preferably downward and in the direction of the longitudinal axis of the lamp.

My improved spread coil filament is not only very efiicient in aliording a perfect ditl'usion of the'light by the use of a vertical loop and loops positioned at right angles thereto, but is of increased. utility commercially, as by its use a unifornrillumination is secured, inasmuch as the light may be equally thrown in every direction, and particularly dmvmvardly where the illumination is generally required to be the strongest, as the filament is so shaped as to present a greater amount of luminous surface at the end of the lamp Where the projection of the rays is downward.

i wish it understood that do not desire to be limited to the exact det ils ol construction shown and described, for, obviously, umdiiicatious will occur to a person skilled in the art.

What i claim as my iuwntion, is:-

I. in an incnmlescent lamp, a spread coil filament comprising a substantial y vertically disposed loop, and a plurality of loops each constrru'ted and arranged to lie in a relatively approximately horizontal direction the planes of the latter loops interstating ti o longitudiluil axis of the lamp.

.2. In an incamlescent lamp, a s,')read coil -filament comprising a substantially upwardly disposed loop to throw the light sidewisc from the lamp, and a loop at a relatively approximate right angle to the first loop to throw the light substantially in the direction of the longitudinal axis of the lamp.

' 3. In n incandescent lamp, an upwardly disposed filament loop, and a plurality of outer lo ,ps sidewise disposed so that the plane of each of which latter loops intersects the plane of the central loop at an angle.

4. In an incandescent lamp, an upwardly disposed filament loop, a sidewise disposed loop the planes of whlch two loops are constructed and arranged to intersect at an anle, and an anchor for the upwardly disposed oop, the point of anchorage lying approximately in the plane of the side loop.

- 5. 11 an incandescent lamp, an upwardly dis osed filament loop, anchors'located'on eac side of the same at the base thereof, the said filament being turned outwardly from said anchor points and then deflected in a substantially circular form, and curved downward and fastened to the leadin in wires approximately verticall below tie anchor polnts to form a plura ity of sidewise dis- 'planes having an approximate common line of intersection.

6. In an incandescent lamp, an upwardly 5 disposed filament loop, anchors located on each side of the same at the base thereof, the said filament being turned outwardly from said anchor points and then deflected in a substantially circular form, and curved downward and fastened to the leading in Wires approximately below the anchor points to form a plurality of sidewise disposed loops, one of each lying in a that of the central loop.

In testimon of the foregoing specification, I do here y sign the same in the city of Philadel hia, county of Philadelphia and State of ennsylvania, this 29th day of February 1907. 1

FREDERICK M. BENNETT. Witnesses: j

ALBERT J. LEVERING, R. EVERT VERBECK.

plane at an angle to 

